ELECTRONIC KEY SELF-MONITORING METHOD IN A SYSTEM CONTROLLING ACCESS TO A RESOURCE AND ELECTRONIC KEY IMPLEMENTING THE METHOD

摘要

The invention concerns a self-monitoring protocol for an electronic key wherein the key equipped with a real time clock delivering a time variable (VH) and an access right, wherewith is associated a signature value (S(PH) of the validity range (PH) concerning this access right. Said method consists in verifying, from a specific verification key, the signature value (S(PH) of the validity range (PH) concerning the access right; comparing the time variable (VH) with the validity range (PH); and the electronic key is self-invalidated in case of a negative response to one of the verification and comparison steps respectively.